starting ACL trial version without windows?

Is it possible to start the trial version of ACL
without it opening any windows?  I tried the
following, but it's still popping up lots of
windows:

allegro-ansi +B +c

(I would like to use ACL with Slime, but loading
Slime in ACL's "Debug Window" doesn't work, possibly
because it redirects all the standard I/O streams to
synonym streams.)

I am running on Windows 2000 with the ACL 6.2 trial version.